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// XnMapSequenceListConverter.h
#ifndef _XNMAPSEQUENCELISTCONVERTER_H_
#define _XNMAPSEQUENCELISTCONVERTER_H_
namespace xn
{
template <typename PixelType>
class XnMapSequenceListConverter
{
private:
typedef XnUInt16 ValueType;
struct ValueHeader
{
ValueType nValue;
XnUInt16 nSequences;
};
struct Sequence
{
XnUInt16 nOffset;
XnUInt16 nSequenceCount;
};
XnStatus FillMapTopDown(PixelType* pMap, XnUInt32 nHeight, XnUInt32 nWidth, XnUInt32& nX, XnUInt32& nY, XnUInt32 nPixels, PixelType val)
{
XnUInt32 nCurrIndex = nWidth * nY + nX;
for (XnUInt32 pxl = 0; pxl < nPixels; pxl++ )
{
// Check indexes
if (nX >= nWidth || nY >= nHeight)
{
return XN_STATUS_BAD_PARAM;
}
pMap[nCurrIndex] = val;
nY++;
if (nY == nHeight)
{
// Move to next column start
nY = 0;
nX++;
nCurrIndex = nX;
}
else
{
// Move next row, same column
nCurrIndex += nWidth;
}
}
return XN_STATUS_OK;
}
public:
// We processing the map up down first, because people are more likely to stand next to each other than on top of each other.
XnStatus MapToSequenceList(const PixelType* pMap, XnUInt32 nHeight, XnUInt32 nWidth, XnUChar* pSeqBuffer, XnUInt32& nSeqSize)
{
const PixelType NA_PIXEL = (PixelType)-1;
const PixelType MAX_PIXEL_SIZE = (1 << sizeof(ValueType) * 8) - 1;
// Current sequence related data
XnUInt16 nOffsetCount = 0;
PixelType sequncePixel = NA_PIXEL;
// Value related data
ValueHeader* pCurrValueHeader = NULL;
Sequence* pCurrSeq = NULL;
// Output related data
XnUChar* pCurrOutput = pSeqBuffer;
XnUInt nCurrOutputSize = 0;
const PixelType* pColumn = pMap;
for (XnUInt32 x = 0; x < nWidth; x++)
{
const PixelType* pCurr = pColumn;
for (XnUInt32 y = 0; y < nHeight; y++)
{
// Make sure no pixel uses NA_PIXEL value and that the pixel will fit ValueHeader.nValue
if (*pCurr == NA_PIXEL || *pCurr > MAX_PIXEL_SIZE)
{
return XN_STATUS_BAD_TYPE;
}
// See if the pixel is part of an offset
if (*pCurr == 0)
{
nOffsetCount++;
sequncePixel = NA_PIXEL;
pCurrSeq = NULL;
}
// See if the pixel is in a sequence
else if (*pCurr == sequncePixel)
{
XN_ASSERT(pCurrSeq);
pCurrSeq->nSequenceCount++;
}
// New sequnce start
else
{
// Check if we need to add ValueHeader
if (!pCurrValueHeader || pCurrValueHeader->nValue != *pCurr)
{
// New value in front of us, add value header
nCurrOutputSize += sizeof(ValueHeader);
if (nCurrOutputSize > nSeqSize)
return XN_STATUS_INVALID_BUFFER_SIZE;
pCurrValueHeader = (ValueHeader*)pCurrOutput;
pCurrOutput += sizeof(ValueHeader);
pCurrValueHeader->nValue = (ValueType)*pCurr;
pCurrValueHeader->nSequences = 1;
}
else
{
pCurrValueHeader->nSequences++;
}
// Store new sequence pixel
sequncePixel = *pCurr;
// Add sequence data
nCurrOutputSize += sizeof(Sequence);
if (nCurrOutputSize > nSeqSize)
return XN_STATUS_INVALID_BUFFER_SIZE;
pCurrSeq = (Sequence*)pCurrOutput;
pCurrSeq->nOffset = nOffsetCount;
pCurrSeq->nSequenceCount = 1;
nOffsetCount = 0;
pCurrOutput += sizeof(Sequence);
}
// Move to next row
pCurr += nWidth;
}
pColumn++;
}
nSeqSize = nCurrOutputSize;
return XN_STATUS_OK;
}
XnStatus SequenceListToMap(XnUChar* pSeqBuffer, XnUInt32 nSeqSize, PixelType* pMap, XnUInt32 nHeight, XnUInt32 nWidth)
{
XnUInt32 nCurrProcessed = 0;
XnUInt32 nX = 0;
XnUInt32 nY = 0;
XnUChar* pCurr = pSeqBuffer;
// Default all pixels
xnOSMemSet(pMap, 0, sizeof(PixelType) * nHeight * nWidth);
while (nCurrProcessed != nSeqSize)
{
nCurrProcessed += sizeof(ValueHeader);
if (nCurrProcessed > nSeqSize)
return XN_STATUS_INVALID_BUFFER_SIZE;
// Get the value header
ValueHeader* pCurrValue = (ValueHeader*)pCurr;
pCurr += sizeof(ValueHeader);
// Loop on value sequences
for (XnUInt16 nSeq = 0; nSeq < pCurrValue->nSequences; nSeq++ )
{
nCurrProcessed += sizeof(Sequence);
if (nCurrProcessed > nSeqSize)
return XN_STATUS_INVALID_BUFFER_SIZE;
Sequence* pSeq = (Sequence*)pCurr;
pCurr += sizeof(Sequence);
// Add offset to x,y
XnUInt nNaiveY = nY + pSeq->nOffset;
nX += nNaiveY / nHeight;
if (nX >= nWidth)
return XN_STATUS_BAD_PARAM;
nY = nNaiveY % nHeight;
// Fill value
XnStatus rc = FillMapTopDown(pMap, nHeight, nWidth, nX, nY, pSeq->nSequenceCount, (PixelType)pCurrValue->nValue);
XN_IS_STATUS_OK(rc);
}
}
return XN_STATUS_OK;
}
};
}
#endif
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